Exchanged case from Optiplex GX270, no boot

Hello, I have just exchanged case, since i wanted to go water cooling. I have preparated out those two miniboards, that start the computer and plugged everything in. Now when i press the start button, everything starts to spin, but i get no visual. Can't get even to BIOS. The computer worked before and I am certain i did not damage any components. What might i have missed?

I really appreciate it. As I have already mentioned, i switched to water cooling, therefore the fan is not connected (i also tried to connect it together with water). So I have reseated the processor, but I still get no POST. I am really running out of ideas.

I really appreciate it. As I have already mentioned, i switched to water cooling, therefore the fan is not connected (i also tried to connect it together with water). So I have reseated the processor, but I still get no POST. I am really running out of ideas.

Check to make sure all of your cards and memory are seated properly. Remove all of the cards and reseat them. Best way to do it is remove everything, then put your RAM back in. See if it will POST (Power On Self Test, e.g. the single beep). If so, start putting each expansion card (e.g. video, audio, raid, etc) in one at a time and see if it will POST. Also, make sure your CPU and heatsink are seated properly. While changing cases shouldn't change anything, a stray bump in the process could have dislodged things.

Usually the only thing that would keep it from passing POST is the processor or memory issues. Also, make sure the ATX power connector is connected. I'd reseat the processor, being careful not to mess up the thermal paste. Lastly, make sure the CPU fan is A) connected and B) to the right fan pins.Usually the only thing that would keep it from passing POST is the processor or memory issues. Also, make sure the ATX power connector is connected. I'd reseat the processor, being careful not to mess up the thermal paste. Lastly, make sure the CPU fan is A) connected and B) to the right fan pins.

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Try opening up the case of the machine. Once opened, locate the memory module(s), remove it/them by unlocking the locking ends. Make sure you hold the modules by the edges avoiding touching the chips on them. Put them back, locking them tightly in place. The machine sghould work

PCI Slot 1 problem it appears. This means opening the case and reseating all the above-board cards such as video, audio, ethernet, etc.

Shut down the computer and unplug it. Press and hold the power button for a slow count of at least 10. Then you may open the case. How your case opens depends on the model. If this computer is what I think it is and you're unfamiliar with going inside the case I would suggest taking it to a repair shop. The Optiplex computers I've been inside of of are awkward to work with.

sounds luike you might have had a virise and its wiped somonthing it souldint have out you can save your things in safe mode and re do the os (reinstall windows ) if you recantly conected hardware to then unistall and disonect it then retry it